4 Configuration
DES-1210 Series Switch Web UI Reference Guide
DHCP Relay Agent Information Option 82 Check:
This field can be toggled between Enabled and
Disabled using the pull-down menu. It is used to enable or disable the Switches ability to check the validity of
the packet’s option 82.
Enabled –
When the field is toggled to
Enabled
, the relay agent will check the validity of the packet’s
option 82 fields. If the switch receives a packet that contains the option-82 field from a DHCP client,
the switch drops the packet because it is invalid. In packets received from DHCP servers, the relay
agent will drop invalid messages.
Disabled -
When the field is toggled to Disabled, the relay agent will not check the validity of the
packet’s option 82 fields.
DHCP Relay Agent Information Option 82 Policy:
This field can be toggled between Replace, Drop, and
Keep by using the pull-down menu. It is used to set the Switches policy for handling packets when the
DHCP
Agent Information Option 82 Check
is set to Disabled. The default is
Replace
.
Replace -
The option 82 field will be replaced if the option 82 field already exists in the packet
received from the DHCP client.
Drop -
The packet will be dropped if the option 82 field already exists in the packet received from the
DHCP client.
Keep -
The option 82 field will be retained if the option 82 field already exists in the packet received
from the DHCP client.
DHCP Relay Agent Information Option 82 Remote ID:
This field can be toggled between Default and User
Define.
NOTE:
If the Switch receives a packet that
contains the option-82 field from a DHCP client
and the information-checking feature is enabled,
the switch drops the packet because it is invalid.
However, in some instances, you might configure
a client with the option-82 field. In this situation,
you should disable the information-check feature
so that the switch does not remove the option-82
field from the packet. You can configure the action
that the switch takes when it receives a packet
with existing option-82 information by configuring
the
DHCP Agent Information Option 82 Policy
.
System > DHCP Relay > DHCP Relay Interface Settings
This page allows the user to set up a server, by IP address, for relaying DHCP information the switch. The
user may enter a previously configured IP interface on the Switch that will be connected directly to the DHCP
server using the following window. Properly configured settings will be displayed in the
BOOTP Relay Table
at the bottom of the following window, once the user clicks the
Add
button under the
Apply
heading. The
user may add up to four server IPs per IP interface on the Switch. Entries may be deleted by clicking Delete
button.
Figure 4.28 – System > DHCP Relay > DHCP Relay Interface Settings
Interface
: The IP interface on the Switch that will be connected directly to the Server.
Server
IP: Enter the IP address of the DHCP server. Up to four server IPs can be configured per IP Interface.
Click
Apply
to implement changes made.
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